This test does not pass for -target i686-pc-windows-gnu (-mingw32)

when clang is built with mingw-w64 4.9.1 or according to 
http://llvm.org/PR20995  , mingw-w64 4.7.2 as well.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@224453 91177308-0d34-0410-b5e6-96231b3b80d8

test/Modules/compiler_builtins.m

@@ -1,3 +1,4 @@
+// XFAIL:mingw32,windows-gnu
 // RUN: rm -rf %t
 // RUN: %clang -fsyntax-only -fmodules -fmodules-cache-path=%t -D__need_wint_t %s -Xclang -verify
 // RUN: %clang -fsyntax-only -std=c99 -fmodules -fmodules-cache-path=%t -D__need_wint_t %s -Xclang -verify